//方法一
export function formatDate(val) {
  let date = new Date(Number(val)); //时间戳为10位需*1000，时间戳为13位的话不需乘1000
  let Y = date.getFullYear() + "-";
  let M = (date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1) + "-";
  let D = date.getDate() + " ";
  let h = date.getHours() + ":";
  let m = date.getMinutes() + ":";
  let s = (date.getSeconds() < 10 ? "0" + (date.getSeconds()) : date.getSeconds());
    return Y + M + D + h + m + s;
}
